all hals: reexport PAC if unstable-pac feature is set.

embassy-rp/Cargo.toml

@@ -5,6 +5,13 @@ authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
 edition = "2018"
 
 [features]
+
+# Reexport the PAC for the currently enabled chip at `embassy_rp::pac`.
+# This is unstable because semver-minor (non-breaking) releases of embassy-nrf may major-bump (breaking) the PAC version.
+# If this is an issue for you, you're encouraged to directly depend on a fixed version of the PAC.
+# There are no plans to make this stable.
+unstable-pac = []
+
 defmt-trace = [ ]
 defmt-debug = [ ]
 defmt-info = [ ]

embassy-rp/src/lib.rs

@@ -5,7 +5,10 @@
 #![feature(never_type)]
 #![allow(incomplete_features)]
 
+#[cfg(feature = "unstable-pac")]
 pub use rp2040_pac2 as pac;
+#[cfg(not(feature = "unstable-pac"))]
+pub(crate) use rp2040_pac2 as pac;
 
 // This mod MUST go first, so that the others see its macros.
 pub(crate) mod fmt;